diff -Naur postgresql-9.2.0.sockets/src/include/pg_config_manual.h postgresql-9.2.0/src/include/pg_config_manual.h
--- postgresql-9.2.0.sockets/src/include/pg_config_manual.h	2012-09-06 17:26:17.000000000 -0400
+++ postgresql-9.2.0/src/include/pg_config_manual.h	2012-09-06 18:13:18.183092471 -0400
@@ -144,7 +144,7 @@
  * here's where to twiddle it.  You can also override this at runtime
  * with the postmaster's -k switch.
  */
-#define DEFAULT_PGSOCKET_DIR  "/tmp"
+#define DEFAULT_PGSOCKET_DIR  "/run/postgresql"
 
 /*
  * The random() function is expected to yield values between 0 and
